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/*
This file is part of go-ethereum
go-ethereum is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
go-ethereum is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
package rpcws
import (
"fmt"
"net"
"net/http"
"code.google.com/p/go.net/websocket"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/event/filter"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/xeth"
)
var wslogger = logger.NewLogger("RPC-WS")
type WebSocketServer struct {
eth *eth.Ethereum
filterManager *filter.FilterManager
port int
doneCh chan bool
listener net.Listener
}
func NewWebSocketServer(eth *eth.Ethereum, port int) (*WebSocketServer, error) {
sport := fmt.Sprintf(":%d", port)
l, err := net.Listen("tcp", sport)
if err != nil {
return nil, err
}
filterManager := filter.NewFilterManager(eth.EventMux())
go filterManager.Start()
return &WebSocketServer{eth,
filterManager,
port,
make(chan bool),
l,
}, nil
}
func (self *WebSocketServer) handlerLoop() {
for {
select {
case <-self.doneCh:
wslogger.Infoln("Shutdown RPC-WS server")
return
}
}
}
func (self *WebSocketServer) Stop() {
close(self.doneCh)
}
func (self *WebSocketServer) Start() {
wslogger.Infof("Starting RPC-WS server on port %d", self.port)
go self.handlerLoop()
api := rpc.NewEthereumApi(xeth.New(self.eth))
h := self.apiHandler(api)
http.Handle("/ws", h)
err := http.Serve(self.listener, nil)
if err != nil {
wslogger.Errorln("Error on RPC-WS interface:", err)
}
}
func (s *WebSocketServer) apiHandler(api *rpc.EthereumApi) http.Handler {
fn := func(w http.ResponseWriter, req *http.Request) {
h := sockHandler(api)
s := websocket.Server{Handler: h}
s.ServeHTTP(w, req)
}
return http.HandlerFunc(fn)
}
func sockHandler(api *rpc.EthereumApi) websocket.Handler {
fn := func(conn *websocket.Conn) {
for {
wslogger.Debugln("Handling request")
var reqParsed rpc.RpcRequest
if err := websocket.JSON.Receive(conn, &reqParsed); err != nil {
wslogger.Debugln(rpc.ErrorParseRequest)
websocket.JSON.Send(conn, rpc.RpcErrorResponse{JsonRpc: reqParsed.JsonRpc, ID: reqParsed.ID, Error: true, ErrorText: rpc.ErrorParseRequest})
continue
}
var response interface{}
reserr := api.GetRequestReply(&reqParsed, &response)
if reserr != nil {
wslogger.Errorln(reserr)
websocket.JSON.Send(conn, rpc.RpcErrorResponse{JsonRpc: reqParsed.JsonRpc, ID: reqParsed.ID, Error: true, ErrorText: reserr.Error()})
continue
}
wslogger.Debugf("Generated response: %T %s", response, response)
websocket.JSON.Send(conn, rpc.RpcSuccessResponse{JsonRpc: reqParsed.JsonRpc, ID: reqParsed.ID, Error: false, Result: response})
}
}
return websocket.Handler(fn)
}
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